tow mirror question

Hello all. I'm new to these forums and had a question regarding mirrors. I just purchased a 1999 C2500 crewcab (OBS) a few weeks ago; it is a automatic, with a 350V8. Getting ready to plan a trip and will be pulling a 30' Jayco. The truck has factory non-towing mirrors and i was wondering where the best (or cheapest) place to order a set of towing mirrors. Mine are powered but not sure if they are heated, as i don't see a button/switch anywhere for this function. Any recommendation would be appreciated. TIA, James

Hello all. I'm new to these forums and had a question regarding mirrors. I just purchased a 1999 C2500 crewcab (OBS) a few weeks ago; it is a automatic, with a 350V8. Getting ready to plan a trip and will be pulling a 30' Jayco. The truck has factory non-towing mirrors and i was wondering where the best (or cheapest) place to order a set of towing mirrors. Mine are powered but not sure if they are heated, as i don't see a button/switch anywhere for this function. Any recommendation would be appreciated. TIA, James